David Oliver (USA) wins the 110 hurdles in 13.00 seconds at the 14th IAAF World Championships in Athletics at Luzhniki Stadium in Moscow on Aug. 12. Kirby Lee, USA TODAY Sports

Reese Hoffa (USA) throws 67 feet in the shot put qualifying to advance in the 14th IAAF World Championships in Athletics at Luzhniki Stadium in Moscow on Thursday. He advanced to the final. Kirby Lee, USA TODAY Sports

LaShawn Merritt (left) and Tony McQuay (USA) take a victory lap after finishing first and second in the 400 in Moscow. Kirby Lee, USA TODAY Sports

Mohammed Aman of Ethiopia celebrates after defeating Nick Symmonds of the U.S. to win the 800. Symmonds became the first American man to win a medal at worlds in the event in 16 years. Kirby Lee, USA TODAY Sports

In the long jump, Brittney Reese (USA) wins gold at the IAAF World Championships in Athletics at Luzhniki Stadium in Moscow on Aug. 11. Kirby Lee, USA TODAY Sports

Decathlon winner Ashton Eaton (USA) during the javelin at the IAAF World Championships in Athletics. Kirby Lee. USA TODAY Sports

Natasha Hastings (USA) in the starting blocks of the women's 400 final at the IAAF World Championships in Athletics at Luzhniki Stadium in Moscow on Aug. 12. She finished fifth. Kirby Lee Kirby Lee-USA TODAY Sports